Question

Use snhpinventorytest;
CREATE TABLE Persons (
    PersonID INT(11) unsigned NOT NULL auto_increment,
        PRIMARY KEY (PersonID),
    FirstName Varchar (50), 
    Lastname varchar(50)   
)   ENGINE=INNODB;

Use snhpinventorytest;
CREATE TABLE if not exists Locations (
    LocationID INT(11) UNSIGNED NOT NULL auto_increment,
    PRIMARY KEY (LocationID),
    PersonID int(11) unsigned,
        INDEX PersonID_IDX (PersonID),
    BuildingName varchar(50),
    LocationType varchar(50),
    RoomNumber varchar (20),
        FOREIGN KEY (FK_PersonID) REFERENCES Person(PersonID)
            ON DELETE CASCADE
            ON UPDATE CASCADE
)  ENGINE=INNODB;

Use snhpinventorytest;
CREATE TABLE if not exists assets (
    AssetID INT(11)  UNSIGNED NOT NULL auto_increment,
     PRIMARY KEY (AssetID),
     PersonID int(11) unsigned,
        INDEX PersonID_IDX (PersonID),
     FOREIGN KEY (FK_PersonID) REFERENCES Person(PersonID)
        ON DELETE CASCADE
        ON UPDATE CASCADE
)   Engine=INNODB;

我是MySQL新手。使用Workbench 6.2 我可以创建Person表，但不能创建Locations或Assets表 1005和（错误150）建议表示赞赏。我认为围绕外键的语句顺序可能不正确，但不确定如何？

Answer 1

您必须更改代码才能正常工作。

您需要一个CONSTRAINT名称并使其成为独特的名称。然后你需要提供正确的FOREIGN KEY而不是任何名字。例如，FOREIGN KEY（FK_PersonID）应为FOREIGN KEY (PersonID)

也你不需要使用USE snhpinventorytest; 3次:)你可以使用它一次。

我希望这会有所帮助

试试此代码

USE snhpinventorytest;
CREATE TABLE Persons (
    PersonID INT(11) unsigned NOT NULL  auto_increment,
        PRIMARY KEY (PersonID),
    FirstName Varchar (50), 
    Lastname varchar(50)   
)   ENGINE=INNODB;

CREATE TABLE locations (
 LocationID int(11) unsigned NOT NULL AUTO_INCREMENT,
 PersonID int(11) unsigned DEFAULT NULL,
 BuildingName varchar(50) DEFAULT NULL,
 LocationType varchar(50) DEFAULT NULL,
 RoomNumber varchar(20) DEFAULT NULL,
 PRIMARY KEY (LocationID),
 KEY PersonID_IDX (PersonID),
 CONSTRAINT FK_PersonID1 FOREIGN KEY (PersonID) REFERENCES persons (PersonID) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE IF NOT EXISTS assets (
    AssetID INT(11)  UNSIGNED NOT NULL auto_increment,
     PRIMARY KEY (AssetID),
     PersonID int(11) unsigned,
        INDEX PersonID_IDX (PersonID),
     CONSTRAINT FK_PersonID2 FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
        ON DELETE CASCADE
        ON UPDATE CASCADE
)   Engine=INNODB;

在MySQL 5.5中创建三个相关表

1 个答案: